cmd_time: merge run_command_and_time_it with cmd_process

As far as every arch has a get_timer function,
run_command_and_time_it code can now disappear.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Acked-By: Che-Liang Chiou <clchiou@chromium.org>
[trini: s/ulong/unsigned long/ in command.h portion]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/common/main.c b/common/main.c
index 9e92687..e2d2e09 100644
--- a/common/main.c
+++ b/common/main.c
@@ -1452,7 +1452,7 @@
 			continue;
 		}
 
-		if (cmd_process(flag, argc, argv, &repeatable))
+		if (cmd_process(flag, argc, argv, &repeatable, NULL))
 			rc = -1;
 
 		/* Did the user stop this? */